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AsthmaVent - Effect of Mechanical Ventilation on Asthma Control in Children (AsthmaVent)

11 maggio 2016 aggiornato da: University of Aarhus

AsthmaVent is a multi-center study, investigating the association between indoor air quality and childhood asthma.

In Denmark, we spend more and more time indoors. Our houses are built airtight to save energy and are difficult to ventilate. We are thus more exposed to our indoor air than ever before. We know that indoor air contains many different components that can affect our airways inappropriately and particularly children with asthma, who have sensitive airways are sensitive to these components. The AsthmaVent project examines whether increased ventilation is able to improve the indoor environment to such an extent that the asthma disease control, for children with asthma and house dust mite allergy improves, resulting in need for less medication.

Previous studies have pointed towards a beneficial effect of mechanical ventilation, on both the indoor air quality and on children's health and quality of life. There is not currently a consensus in this area, as studies so far have not been large or good enough to confidently determine the effect.

This project is big and is designed so that it takes into account the sources of error seen in previous studies on the topic.

We include, over a 3-year period (2012-2014), a total of 80 children with asthma and house dust mite allergy aged 6-18 years, from pediatric departments in Aarhus, Odense, Kolding, Randers and Herning. They are divided into two groups, receiving either active ventilation or placebo ventilation, meaning a non-functioning ventilation system that just recirculates the air in the room. Ventilation systems are installed in the fall and winter and ventilate the child's bedroom during 9 months. Indoor air quality and asthma control are assessed every 3 months, both at home visits were air quality and allergen levels of house dust mites are studies and at visits to the outpatient clinics with control of asthma parameters and quality of life.

The project involves collaboration between several institutions with an interest in indoor air quality in relation to allergies and asthma and with great expertise in the field.The project was initiated by CISBO (Centre for Indoor Environment and Health in Dwellings), a center consisting of several institutions in Denmark dealing with indoor environment: Department of Public Health at Aarhus University and University of Copenhagen, Danish Building Research Institute and the Technical University of Denmark.

Since asthma is the most common chronic childhood disease in Denmark and since the development of allergies and asthma has high social and personal costs, it is important for both society and the individual family, to find out whether simply improving the indoor air quality by increased ventilation can lead to an improvement in asthma disease control.

Panoramica dello studio

Stato

Completato

Condizioni

Intervento / Trattamento

Descrizione dettagliata

The aim of the project is to investigate whether increased ventilation is able to improve the indoor air quality and thereby asthma disease control for children with asthma and house dust mite allergy.

Hypotheses:

  1. An increased ventilation in the home will reduce the need for inhaled steroids in children with house dust mite allergy and asthma.
  2. An increased ventilation in the home will improve the quality of life in children with house dust mite allergy and asthma.
  3. An increased ventilation in the home will improve the indoor environment and thus improve asthma disease control in children with house dust mite allergy and asthma.

Materials and methods: The study is a randomized double-blind placebo-controlled intervention study. The intervention is balanced mechanical ventilation in the bedroom of children with asthma and house dust mite allergy during 9-months.

Population: Over 3 year period (2012-2014) 80 families with asthmatic children aged 6-18 years will be included from out-patient clinics at the children's department of the University Hospitals of Aarhus and Odense and regional hospitals in Kolding, Randers and Herning. Families will also be included from private pediatric clinics in Aarhus.

Randomization: After inclusion children are randomized to either active ventilation or placebo ventilation. Randomization is done in blocks of 4 by center.

Intervention: The ventilation units Type DUPLEX 370 EC4.D and DUPLEX 370 are installed during the fall and run continuously for 9 months. The ventilation system is placed outside the house and provides filtered conditioned air to the child's bedroom, through insulated pipes mounted in a window opening. The window opening was built specifically for this purpose in form of a thermo plate replacing the window glass. The unit provides the bedroom with at least 2-3 air changes per hour. The placebo unit (DUPLEX 370) is a completely similar installation which only recirculates the air in the room instead of replacing it. We recommend all parents to wash the duvet and pillow every 3 months.

Data collection:

Data on the children's health is collected every 3 months when the families visit the outpatient clinics. The children are seen by specialist doctors.

At home visits, also every 3 months, data concerning the indoor air quality is collected.

Tipo di studio

Interventistico

Iscrizione (Effettivo)

46

Fase

  • Non applicabile

Contatti e Sedi

Questa sezione fornisce i recapiti di coloro che conducono lo studio e informazioni su dove viene condotto lo studio.

Luoghi di studio

  • Danimarca
    • Region Hovedstaden
      • Herlev, Region Hovedstaden, Danimarca, 2730
        • Børneafdelingen Herlev Hospital
    • Region Midt
      • Aarhus, Region Midt, Danimarca, 8200
        • Childrens Department, Aarhus University Hospital
      • Herning, Region Midt, Danimarca, 7400
        • Childrens Department, Herning Hospital
      • Randers, Region Midt, Danimarca, 8930
        • Childrens DEpartment, Randers Hospital
    • Region Nordsjælland
      • Hillerød, Region Nordsjælland, Danimarca, 3400
        • Childrens Department, Hillerød hospital
    • Region Syddanmark
      • Kolding, Region Syddanmark, Danimarca, 6000
        • Childrens Department, Kolding Hospital
      • Odense, Region Syddanmark, Danimarca, 5000
        • H.C. Andersens Children Hospital, Odense University Hospital

Criteri di partecipazione

I ricercatori cercano persone che corrispondano a una certa descrizione, chiamata criteri di ammissibilità. Alcuni esempi di questi criteri sono le condizioni generali di salute di una persona o trattamenti precedenti.

Criteri di ammissibilità

Età idonea allo studio

Da 5 anni a 18 anni (Bambino, Adulto)

Accetta volontari sani

No

Sessi ammissibili allo studio

Tutto

Descrizione

Inclusion Criteria:

  • Doctors diagnosed asthma
  • Need of inhaled steroid titrated down to at least 400 microg/day of Budesonide or equivalent dose of other corticosteroid
  • Skin prick test >/= 3 mm or specific IgE >/= 0,7 kU/l to house dust mites (Derm. Pteronyssinus and/or Derm. Farinae)
  • more than 500 nanog/gr dust of house dust mite allergen in the childs mattress.
  • Living in a one-family house and will allow changes of the house during the intervention period.
  • Capable of giving informed consent.

Exclusion Criteria:

  • Other clinically relevant allergies to tree pollen or animals present in the house.
  • Other diseases or treatments, as for example immunotherapy, which could influence the results.

Piano di studio

Questa sezione fornisce i dettagli del piano di studio, compreso il modo in cui lo studio è progettato e ciò che lo studio sta misurando.

Come è strutturato lo studio?

Dettagli di progettazione

  • Scopo principale: Trattamento
  • Assegnazione: Randomizzato
  • Modello interventistico: Assegnazione parallela
  • Mascheramento: Quadruplicare

Armi e interventi

Gruppo di partecipanti / Arm
Intervento / Trattamento
Comparatore attivo: Ventilation
Increased ventilation in the childs bedroom to at least 2-3 air changes pr hour.
Dispositivo: Ventilation
The ventilation system is placed outside the house and provides filtered conditioned air to the child's bedroom, through insulated pipes mounted in a window opening. The window opening was built specifically for this purpose in form of a thermo plate replacing the window glass. The unit provides the bedroom with at least 2-3 air changes per hour
Altri nomi:
  • Ventilation units Type DUPLEX 370 EC4.D
Comparatore placebo: Placebo ventilation
Ventilation system that recirculates the air in the childs bedroom
Dispositivo: Placebo Ventilation
The placebo unit (DUPLEX 370) is a completely similar installation to the active ventilation unit, but it only recirculates the air in the room instead of replacing it with fresh conditioned air.
Altri nomi:
  • Placebo ventilation unit type DUPLEX 370

Cosa sta misurando lo studio?

Misure di risultato primarie

Misura del risultato
Misura Descrizione
Lasso di tempo
Changes in dose of inhaled corticosteroid
Lasso di tempo: Baseline, 3 months, 6 months and 9 months
Measured in micrograms of a specific inhaled corticosteroid
Baseline, 3 months, 6 months and 9 months
Changes in particle concentration in child bedroom
Lasso di tempo: baseline, 3 months, 6 months and 9 months
Measured as particles pr. m3
baseline, 3 months, 6 months and 9 months

Misure di risultato secondarie

Misura del risultato
Misura Descrizione
Lasso di tempo
FEV1
Lasso di tempo: Baseline, 3,6 and 9 months
Forced Expiratory Volume after 1 second
Baseline, 3,6 and 9 months
FeNO
Lasso di tempo: Baseline, 3,6 and 9 months
Forced Expiratory Nitric Oxide
Baseline, 3,6 and 9 months
Quality of Life
Lasso di tempo: Baseline, 3,6 and 9 months
Pediatric Asthma Quality of Life Questionaire
Baseline, 3,6 and 9 months
Standard Skin-prick-test and Specific IgE- phadiatop
Lasso di tempo: Baseline and 9 months
Reduction in diameter of skin-prick-test for standard inhalant allergens and reduction in specific IgE for standard inhalant allergens measured in kU/l.
Baseline and 9 months
Asthma Symptoms
Lasso di tempo: During 14 days at baseline, 3, 6 and 9 months
Assessed from a Symptom score scheme
During 14 days at baseline, 3, 6 and 9 months
Peakflow variability
Lasso di tempo: Baseline, 3, 6 and 9 months
Baseline, 3, 6 and 9 months
Ventilation rate
Lasso di tempo: Baseline, 3, 6 and 9 months
Ventilation rate in the childs bedroom and in the Whole house
Baseline, 3, 6 and 9 months
Physical conditions in the child bedroom and whole house
Lasso di tempo: baseline, 3 6 and 9 months
Changes in temperature and humidity
baseline, 3 6 and 9 months
Allergens in child mattress and airborne in child bedroom
Lasso di tempo: baseline, 3, 6 and 9 months
Reduction in allergen levels.
baseline, 3, 6 and 9 months

Collaboratori e investigatori

Qui è dove troverai le persone e le organizzazioni coinvolte in questo studio.

Sponsor

University of Aarhus

Investigatori

  • Direttore dello studio: Torben Sigsgaard, Professor, Aarhus University, Department of Public Health, Section for Environment, Occupation and Health
  • Investigatore principale: Nina V Hogaard, MD, Aarhus University, Dept. of Public Health, Section for Environment, Occupation and Health

Studiare le date dei record

Queste date tengono traccia dell'avanzamento della registrazione dello studio e dell'invio dei risultati di sintesi a ClinicalTrials.gov. I record degli studi e i risultati riportati vengono esaminati dalla National Library of Medicine (NLM) per assicurarsi che soddisfino specifici standard di controllo della qualità prima di essere pubblicati sul sito Web pubblico.

Studia le date principali

Inizio studio

1 agosto 2012

Completamento primario (Effettivo)

1 febbraio 2016

Completamento dello studio (Effettivo)

1 febbraio 2016

Date di iscrizione allo studio

Primo inviato

19 febbraio 2014

Primo inviato che soddisfa i criteri di controllo qualità

19 febbraio 2014

Primo Inserito (Stima)

21 febbraio 2014

Aggiornamenti dei record di studio

Ultimo aggiornamento pubblicato (Stima)

12 maggio 2016

Ultimo aggiornamento inviato che soddisfa i criteri QC

11 maggio 2016

Ultimo verificato

1 maggio 2016

Maggiori informazioni

Termini relativi a questo studio

Parole chiave

Termini MeSH pertinenti aggiuntivi

Altri numeri di identificazione dello studio

  • AstmaVen - 1101

Queste informazioni sono state recuperate direttamente dal sito web clinicaltrials.gov senza alcuna modifica. In caso di richieste di modifica, rimozione o aggiornamento dei dettagli dello studio, contattare register@clinicaltrials.gov. Non appena verrà implementata una modifica su clinicaltrials.gov, questa verrà aggiornata automaticamente anche sul nostro sito web .

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